package com.java.bean;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.io.OutputStream;

import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class CreateImageCode {

    // 图片的宽度。

    private int width = 160;

    // 图片的高度。

    private int height = 40;

    // 验证码字符个数

    private int codeCount = 4;

    // 验证码干扰线数

    private int lineCount = 20;

    // 验证码

    private String code = null;

    // 验证码图片Buffer

    private BufferedImage buffImg = null;

    Random random = new Random();



    public CreateImageCode() {

        creatImage();

    }



    public CreateImageCode(int width, int height) {

        this.width = width;

        this.height = height;

        creatImage();

    }

    public CreateImageCode(int width, int height, int codeCount) {

        this.width = width;

        this.height = height;

        this.codeCount = codeCount;

        creatImage();

    }



    public CreateImageCode(int width, int height, int codeCount, int lineCount) {

        this.width = width;

        this.height = height;

        this.codeCount = codeCount;

        this.lineCount = lineCount;

        creatImage();

    }



    // 生成图片

    private void creatImage() {

        int fontWidth = width / codeCount;// 字体的宽度

        int fontHeight = height - 5;// 字体的高度

        int codeY = height - 8;



        // 图像buffer

        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics g = buffImg.getGraphics();

        // Graphics2D g = buffImg.createGraphics();

        // 设置背景色

        g.setColor(getRandColor(200, 250));

        g.fillRect(0, 0, width, height);



        // 设置字体

        // Font font1 = getFont(fontHeight);

        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);

        g.setFont(font);



        // 设置干扰线

        for (int i = 0; i < lineCount; i++) {

            int xs = random.nextInt(width);

            int ys = random.nextInt(height);

            int xe = xs + random.nextInt(width);

            int ye = ys + random.nextInt(height);

            g.setColor(getRandColor(1, 255));

            g.drawLine(xs, ys, xe, ye);

        }



        // 添加噪点

        float yawpRate = 0.01f;// 噪声率

        int area = (int) (yawpRate * width * height);

        for (int i = 0; i < area; i++) {

            int x = random.nextInt(width);

            int y = random.nextInt(height);


            buffImg.setRGB(x, y, random.nextInt(255));

        }



        String str1 = randomStr(codeCount);// 得到随机字符

        this.code = str1;

        for (int i = 0; i < codeCount; i++) {

            String strRand = str1.substring(i, i + 1);

            g.setColor(getRandColor(1, 255));

            // g.drawString(a,x,y);

            // a为要画出来的东西，x和y表示要画的东西最左侧字符的基线位于此图形上下文坐标系的 (x, y) 位置处



            g.drawString(strRand, i * fontWidth + 3, codeY);

        }



    }



    // 得到随机字符

    private String randomStr(int n) {

        String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";

        String str2 = "";

        int len = str1.length() - 1;

        double r;

        for (int i = 0; i < n; i++) {

            r = (Math.random()) * len;

            str2 = str2 + str1.charAt((int) r);

        }

        return str2;

    }



    // 得到随机颜色

    private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色

        if (fc > 255)

            fc = 255;

        if (bc > 255)

            bc = 255;

        int r = fc + random.nextInt(bc - fc);

        int g = fc + random.nextInt(bc - fc);

        int b = fc + random.nextInt(bc - fc);

        return new Color(r, g, b);

    }



    /**

     * 产生随机字体

     */

    private Font getFont(int size) {

        Random random = new Random();

        Font font[] = new Font[5];

        font[0] = new Font("Ravie", Font.PLAIN, size);

        font[1] = new Font("Antique Olive Compact", Font.PLAIN, size);

        font[2] = new Font("Fixedsys", Font.PLAIN, size);

        font[3] = new Font("Wide Latin", Font.PLAIN, size);

        font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);

        return font[random.nextInt(5)];

    }



    // 扭曲方法

    private void shear(Graphics g, int w1, int h1, Color color) {

        shearX(g, w1, h1, color);

        shearY(g, w1, h1, color);

    }



    private void shearX(Graphics g, int w1, int h1, Color color) {



        int period = random.nextInt(2);



        boolean borderGap = true;

        int frames = 1;

        int phase = random.nextInt(2);



        for (int i = 0; i < h1; i++) {

            double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);

            g.copyArea(0, i, w1, 1, (int) d, 0);

            if (borderGap) {

                g.setColor(color);

                g.drawLine((int) d, i, 0, i);

                g.drawLine((int) d + w1, i, w1, i);

            }

        }



    }



    private void shearY(Graphics g, int w1, int h1, Color color) {



        int period = random.nextInt(40) + 10; // 50;



        boolean borderGap = true;

        int frames = 20;

        int phase = 7;

        for (int i = 0; i < w1; i++) {

            double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);

            g.copyArea(i, 0, 1, h1, 0, (int) d);

            if (borderGap) {

                g.setColor(color);

                g.drawLine(i, (int) d, i, 0);

                g.drawLine(i, (int) d + h1, i, h1);

            }



        }



    }



    public void write(OutputStream sos) throws IOException {

        ImageIO.write(buffImg, "png", sos);

        sos.close();

    }



    public BufferedImage getBuffImg() {

        return buffImg;

    }



    public String getCode() {

        return code.toLowerCase();

    }
// 使用方法



      public void getCode3(HttpServletRequest req, HttpServletResponse response, HttpSession session) throws IOException{
        // 设置响应的类型格式为图片格式
          response.setContentType("image/jpeg");

      //禁止图像缓存。
           response.setHeader("Pragma", "no-cache");
           response.setHeader("Cache-Control", "no-cache");
           response.setDateHeader("Expires", 0);

          CreateImageCode vCode = new CreateImageCode(100,30,5,10);
          session.setAttribute("code", vCode.getCode());
          vCode.write(response.getOutputStream());
    }



}
